Scale.



JOHN B. MARTIN, OF CINCINNATI, OHIO.

SCALE.

pecication of Letters Patent.

:eaten/tea apr. so, 191s.

ippiieaton tiled April 20, 1917. Serial No. 163,526.

To @ZZ rwhom t may concern.'

Be it known that I, JOHN B. MARTIN, a citizen of the United States, residing at Clncinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful improvements in Scales, of which the following is a specification.

Myl invention belongs to that class of scales known as gravity or pendulum scales, and it is cheap of manufacture, simple in construction and highly eiclent in use.

.ln carrying out my invention l employ a number of rollers which I may call a roller system, thus there are no hearing edges to wear fiat or uneven; no springs to break or assume varying degrees of tension and stress, no movable weights to handle, no fric-tional points to retard free action. All the working parts of the scale are rigidly and permanently united and joined together, needing no readjustment.

The weights are triangular in form, havarms extending upward from each end to the required length, connecting firmly with rollers which rest between hearing plates having smooth surfaces, holding the weights pendant; the arms extending still farther upwardly but at an angle sutliciently eccentric to move the weights under pressure, said arms rigidly attached to other rollers of equal diameter, upon which the platform of scales is to rest.

These rollers are attached to the plates with brass straps which hold them in a novel way in their places--one end of the strap being attached `to the roller, and one end to Athe platepreferably a strap at each end of roller in same position, and one strap of doulole width and of same consistency Vattached to the roller between the end straps, but in an adverse position, so that when the arms move they cause the unwinding of the one strap in the center, and the winding up of the two end straps ot reverse application. Any possible resistance ot the straps upon the rollers when in motion is compensated hy the reverse action of each to the other, thereby preserving a balance as though there were no straps used.

The weight, arms and rollers are rigidly connected, as though all were one piece, and cannot get out of order, and have no wear or tear. A second plate used as the platform of the scale is :firmly attached to a connecting post in the center of the upper bearing plate 1n order always to have the pressure in act of weighing to bear upon the center of upper bearing plate that the two weights may be equally engaged.

1 In the accompanying drawing forming part of this specification:

l `1gure 1, is a section on line 1--1 of Fig. 2, looking toward the dial of the scale,

Fig. 2, is a-section taken on line 2 2 of Fig. l, looking toward the dial,

Fig. 3, is a plan of one of the rollers and its connecting straps,

ldig. 4, is a section on line 4 4 of Fig. 3,

Fig. 5, is a plan of a corner of the top part of scale, showing spirit levels, and

Fig. 6, is an isometric view of wedge blocks ll use.'

The hase or frame work of the scale consists of bottom plate 1 and side plates 2, front and hack plates 3 and 4 and top plate 5, all suitably united together.

0n lugs 6-6, of side plates 2, I support a lower hearing plate 7 and above this plate and under top 5 l place the top hearing plate 8.

Between these two hearing plates v and 8, l place two sets of rollers, one set near each end. The lower rollers are marked 9 and the upper rollers l0. The lower rollers are attached to the hearing plate 7 and the upper rollers are attached to the bearing plate 8. This attachment of the rollers is made through the medium of series of straps preterably made of thin copper strips.

Sil

4@n each roller ll place a wide strap 12M centrally located and at each side thereo and equidistant therefrom l place' narrower' straps 13. l`he straps 13 are attached tot e same side of the roller and straps 12 to tle opposite side. The straps of the upper ro lers are attached to the bottom of hearingu plate 8 and the straps of the lower roll rs are attached to the top ofthe lower beari g plate and they hear against said plates yto a minimum degree to prevent friction.

'lhese straps are attached to the bearing plates at their ends 29 in any suitable manner, hut in a. permanent and uniform way,

-so that they will not become displaced, but

maintain a positive fixed position at all times.

l'n the rollers 9 and 10 l cut V-shaped recesses as 14 and l extend the end of the 4straps into said recesses and then place the wedge block 15 into the recesses to irnpin e against said ends and so that they will ho d said straps firmly in place and form a beary supported on upper bearing plate 8 connectcan be leveled at any ing therewith through medium of a center post 20, which passes through and works 1n a slot 21 in top plate v5.

On one of the lower rollers 9, I provide a short extension or shaft 22, to the end of which I attach the dial hand or pointer 23' in any suitable manner. This dial pointer is made heavier at its lower part 30 so as to Ibala-nce the pointer at any angle.

The pointer 23 passes up through a slot 24 in top piece 5. The dial 25 is attached to back 4 or may be made integral therewith, and it carries the Agraduated scale 26.

On one corner of the top plate 5 I attach two spirit levels 27-at right angles to each other, so that both sides and front ofscale time, by turning screws 35 and bottom 1. n y

The arms 17 at their upper extremities are peculiarly shaped and out of a vertical line so that the least Weight on platform 19 will tend, to operate them.

The rollers 9 and 10 are also placed out of a vertical line so 'as to coincide in osi tion to the upper ends of the arms l in order to operate at the slightest weight lon the platform. The dotted lines show the position the parts assume when weight is placed on the platform 19.

When the article. to be weighed is placed.

upon the scale platform, downward pressure will be exerted upon the top bearing plate, this will cause said bearing plate to shift or move as shown in dotted lines in Fig. 1,

causing the rollers to rock to the position shown in dotted lines in said figure; the pendant weights being attached to said rollers will also shift to the position shown in dotted lines in said figure and the pointer being attached to one of said rollers will oscillate and designate the proper weight on the dial. When the weight is removed the parts will assume normal position.

While I have described one specific form of carrying my invention into effect, it will be readily understood that the same is capable of considerable modification without departing from the spirit or principle of the moving What I claim as new and my invention and desire to secure by Letters Patent is:

1. In a scale of the character described, an upper and a lower bearing plate spaced apart, a scale platform attached to the upper plate, upper and lowerrollers between,

said bearing plates, means for flexibly attaching said rollers to said bearing plates so that they may rock when weight is placed on the scale platform, weights pendant from said rollers, the rocking of the rollers moving said weights, a dial on the scale, a pointer attached to one of said rollers, said pointer moving when the roller rocks, to designate the weight.

2. In a scale of the character described, an upper and a lower bearing plate, spaced apart, a scale platform attached to the upper plate, upper and lower rollers, means for flexibly attaching said rollers between said plates' so that they may rock when weight is placed upon said scale platform, weights pendant from said rollers, the rocking of the rollers moving said weights, said scale platform, rollers and weights operatmg simultaneously, a dial on the scale, a

pointer attached to one of said rollers and with the roller to designate the weight.

- 3. In a scale of the character described, an upper and a lower bearing plate spaced apart, a scale platform attached to the upper plate, upper and lower' rollers attached between said plates by straps so that they may rock when weight is placed on the scale platform, weights pendant from said rollers, the rocking of the rollers moving said Weights, a dial on the scale, a pointer attached to one of said rollers, said pointer moving when the rollers rock, to designate Ythe weight.

4. In a Scale of the characterl described, an upper and a lower bearing plate spaced apart, a scale platform attached to said upper plate, upper and lower rollers between 5.. In a scale of the character described, y

an upper and a lower bearing plate spaced apart, a scale platform attached to the upper plate, upper and lower rollers between said plates and means for flexibly connecting said rollers between said plates so that they may rock when weight is placed onthe scale platform, arms depending from said rollers and carrying Weights at their lower extremities, the lower part of the arm carrying the weight being atan angle to the 5 upper part of the arm carrying the upper roller, a dial on the scale, a pointer attached to one of said rollers and moving when the roller rocks to designate the weight.

6. In a scale of the character described, .10 an upper and a lower set of rollers, means for supporting said rollers, a platform for said scale, said platform supported and carried by said rollers, means for lexibly'connecting said rollers to their supporting' means so that they may rock when weight is placed lon the scale platform, weights pendant from said rollers, the rocking of the rollers moving said weights, a dial on the scale, a pointer connected with the rollers, said pomter moving when the rollers rock to designate the weight.

' In testimony-whereof I aiix my signature in the presence of two Witnesses.

H. E. CARsTENs, JOHN W. STREHLI. 

